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Joined: Jan 2002
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Originally Posted By: Geo. Newbern
Originally Posted By: eightbore
George Newbern, Roster did not say anything like what you "said he said". Maybe you could reword your statement. He doesn't like any smokeless load in any composite barrel gun from what I can read. He has no idea what he is talking about.


Roster said about what I said he said regarding the necessity of low pressure, and he opined that higher pressures up 10,000 psi wouldn't hurt. He didn't say anything about my separate opinion regarding use of bismuth in damascus. That was on me...Geo


Many of us reduce pressure in our 2 3/4" reloads in order to shoot them in guns with 2 1/2" chambers. Based on information from Sherman Bell's "Finding Out for Myself" articles in Double Gun Journal. Given that the SAAMI standard service pressure for the 12ga is 11,500 psi, it's not a good idea to shoot most American factory ammo in foreign doubles or vintage American doubles if they didn't leave the factory with 2 3/4" chambers. But if you are working with a formula that puts you in the 8,000 psi range (easy to do with 12ga reloads) you won't come anywhere close to 10,000 psi even factoring in the increase (typically a few hundred psi) that results from the longer hull in the shorter chamber. You can also eliminate much of that pressure jump by having the forcing cones lengthened but leaving the chamber alone.

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Not being able to post the page of low pressure load data here, I put on Trapshooters.com. Check that out if you're interested.

https://www.trapshooters.com/threads/very-low-pressure-loads.887683/

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KYJ
please clarify for me - is > 8,000 psi a low pressure load in the 20G?

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Originally Posted By: greener4me
KYJ
please clarify for me - is > 8,000 psi a low pressure load in the 20G?


I'd say it's pretty low for a 20ga. The smaller the bore, the higher the pressure. Much easier to make up low pressure 12ga reloads vs 20ga or smaller.

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If you look you can find several 7/8 ounce loads that come in under
8,000 psi.. Two of my favorites are 800X 1200fps at 7500 psi and a
572 load which is 1150fps at 7,200 psi. I have used both and they are listed on Hodgdon powder site and I had the pressures confirmed by testing. Both use common components which I like a lot. I hate speciality loads with some weird was which seems to be sold only one place in the world.

Ive even seen 12 loads with pressure as low as 3,500psi at 1125 fps. But I always worry about cold weather ignition problems with ultra light loads.

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Thank you KYJ.

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If you have a 20 bore that was proofed at 850 bar, which is 12,328.2 psi and load and shoot loads which are 8,000 psi or lower you are using loads which are 551.6 bar. While not fire cracker loads they will do the job. I have decided to take a middle of the road approach for my doubles which is to use a moderate load and adjust my shooting to that limitation. I know I am working well under what many consider Service Pressures. I have a load which should be more than safe for use in all my doubles which are sound enough to shoot.

You can even find loads which are in the 7,000 psi range which is 482.6 bar. From 7,000-8,000 psi I look for the load which seems to pattern best for hunting. For clay targets I am happy with them all. Find what you are looking for in load performance and work to having several options that are safe for your needs.

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Originally Posted By: greener4me
KYJ
please clarify for me - is > 8,000 psi a low pressure load in the 20G?

Concur with KY 8,000 PSI is the appropriate line for low pressure 20ga. A search for loads in the range are will give you many options.


Michael Dittamo
Topeka, KS
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