Bullet Seating Depth Redding Reloading

With Help From Redding

 

Redding reloading On setting bullet depth This is how it all started:
Hi I am building a web site that is a review on reloading presses. I was trying to check your company site out for information accurate to your products and found the bullet comparator. I have been watching for this product to be invented. There are a few products out now that claim this but it is bull. Does your bullet comparator set the seating depth uniquely to each rifle. If it is just a factory setting I can do better with my own method. In setting up for long range shooting I use a candle method and seat the bullet so it is with in a few thousands of an inch of the bullet touching the lands for my gun every gun can be different. I would like to know how your product determines this because I have seen no product out now that does this with any degree of accuracy. I would gladly promote a product that would work for this but I have not seen one yet. Can you send me more information on how your product does this. I have been reloading for over 25! years and also have a few well established websites promoting reloading products

Bullet Seating  Depth Redding Reloading

This the answer I got Back from Robin Sharpless at Redding Manufacturing;Bullet Seating depth

Redding reloading On setting bullet depth This is how it all started:
Hi I am building a web site that is a review on reloading presses. I was trying to check your company site out for information accurate to your products and found the bullet comparator. I have been watching for this product to be invented. There are a few products out now that claim this but it is bull. Does your bullet comparator set the seating depth uniquely to each rifle. If it is just a factory setting I can do better with my own method. In setting up for long range shooting I use a candle method and seat the bullet so it is with in a few thousands of an inch of the bullet touching the lands for my gun every gun can be different. I would like to know how your product determines this because I have seen no product out now that does this with any degree of accuracy. I would gladly promote a product that would work for this but I have not seen one yet. Can you send me more information on how your product does this. I have been reloading for over 25! years and also have a few well established websites promoting reloading products.

This device does not work with the chamber at all but rather has the ability to measure from the case head to the land bearing point on the bullet. Once you have your “perfect” loaded round it can be measured and therefore all additional loads can be seated to have the exact same distance from case head to land bearing point (or point of initial engagement on the rifling) as a way to standardize bullet jump and uniform the pressure curves of the rounds.

Attached here is a brief on the concept for your reviewBullet Seating Depth

Point of engagement   Bullet Seating  Depth Redding Reloading

Premise: As all seaters contact the bullet at a point on the ogive which is not the initial point of engagement (IPE) a method is needed to accurately seat the bullet so the (IPE) is set at a point which is consistent and repeatable in relation to the lands of the rifle barrel.

Redding offers a solution composed of three of their products.

T-7 Turret Press
Instant Indicator
Competition Seating Die.

The concern was raised by a number of Comp seater customers who had concerns that the overall length of a loaded cartridge varied even when the comp seater was used properly. This of course was a function of the variability of the uniformity of the selected bullets ogive. All seaters contact a specific diameter of the bullet based on the shape and diameter of the cavity within the seat plug or seat stem. Non seat off of the metplat. As all things made by man have tolerance as a function of their production. The diameter in question can be either minutely lower or higher on the ogive creating the variance in overall length.

I liken it to a specific slice of the baloney with the exact diameter. This baloney slice though is not the critical one but the one which comprises the Initial point where the bullet contacts the rifling (IPE) is critical. As the above documents the variability in the ogive from bullet to bullet we can easily make the case that the IPE appears at a different point from bullet to bullet as well. Foe accuracy and consistency we need the (IPE) to be exactly the same distance from the lands in each round. Until now with this method there has not been an easy way to accomplish this.

Todd you can better explain why this is important. Mechanical issues of start pressure bullet jump etc.

OK the method.

We create a master loaded round with a specific bullet jump distance from the lands.

Using a T-7 turret press we set up the instant indicator using the bore diameter bushing with the Dial indicator set at zero. This establishes a baseline . The Instant indicator is easy to use accurate and completely repeatable.

Next in the T-7 set up a competition seating die. Seat the bullet intentionally long. Rotate the turret and check the length to the (IPE). The dial indicator will tell you just how many thousandths long you are to the (IPE) in relation to the baseline round.
My new request; The tool I am hoping to see made is the one to achive the initial seating depth You spoke of in your letter as a master loaded round. I have tried a cople different methods for this and used a felt pen and checked the marks when the bullet just touches the lands. Then back the bullet up a few thousands then I can if I have this right get extremely smaller groups and if they need to be tighter I can at times adjust my powder loads to correct.
If you have a better way to get the exact measurement for the master round I would love to post that system on my website. I would sure like to be more sure of this measurement.

Bruce

Please feel free to use the letter

I have an odd way to do what you are after. It is a bit complicated and does use a number of tools.

I begin with a fired case and a bushing neck die. I use a “too big” bushing that only gives me about .0..1″ of neck tension

I intentionally long seat a bullet in an unprimed, uncharged case.

I then put this dummy into my rifle and close the bolt. this seats the engagement point of the ogive on the lands.

Holding the rifle vertical, I carefully place a cleaning rod down the barrel to put small pressure on the bullet. Not to move it but to assist it in releasing from the rifling as I open the bolt.

I now have made a dummy round into the lands for sure. In fact I make 3 as aback check

Next I use a taper crimp die to get a non seating but solid crimp to keep the bullet from moving.

Finally, I set up my instant indicator with the contactor that is land diameter and zero set my dial indicator,

On three rounds if all are the same we are good and precise.

We now have a true ZERO into the lands. now go to the letter I sent and use the process to make whatever works best – 0.004 – 0.006 etc by simply long seating and then using the comp seater to “do the math” for the proper seating. Do not be surprised if COAL varies as bullets are different in a lot but we now are solid on our bullet jump and resulting pressure curve.

Hope this is helpful

Robin Sharpless

Executive Vice President

Redding Reloading Equipment

Phone 607-753-3331

Fax 607-756-8445

www.redding-reloading.com

This is an affiliate website



One Response to “Bullet Seating Depth Redding Reloading”

  1. Samantha says:

    Hi there I loved your great article on Bullet Seating Depth Redding Reloading. Thanks for taking the time to publish.
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