Best 20 G hull

Tom Flanigan · 05-08-2018, 06:13 PM

I guess I agree with all of the above. I would still like to see a categorical statement by someone with a relevant degree with respect to pressure and recoil. I'll try to find something. No offense to anyone, but my training is to go to the source for technical information, regardless of the type. All else is hearsay, word of mouth and experiences that may be misleading. I am an IT engineer by training, although my current capacity is director of an IT organization within Verizon. I plan to retire at the end of June.

The Lyman Manual did the primer variance testing to make the point that primers do matter and there should be no deviation from the components listed for each load in the book. Great advice. They took the exact same load and used the different primers to show the difference between them with respect to pressures. My thoughts with respect to the different primer pressures came from this study.

Different powder burn rates probably have an impact on felt recoil. This could be why my loads are so much more comfortable to shoot than the factory loads. My main powders were IMR 4756 and powders with similar characteristics depending on the shot charge I was using. My IMR 4756 is running out so I'll have to get a new manual that has the latest powders in addition to the old that are still available. But I'll still choose the lowest pressure loads.

This has been an interesting conversation.

Double Lab · 05-08-2018, 08:02 PM

You have to keep in mind that the commercial loadings of the ammo companies load their ammo to higher pressures so as to operate the many jamomatics out there that are probably cleaned once a year. Couple that with the insane desire of the average American shooter for those 1250-1400fps. loads which they think they need to shorten their leads and reach out to 60yds. to break a target and kill a bird.

One of my best friends and long time shooting buddies was an Executive VP, an engineer by trade, at a local defense contractor and did every test imaginable on our handloads and many commercial loads. One of his projects was developing a flechette round for the military. Pressure and velocity were very important.

Anyway, pressure DOES NOT affect recoil velocity does. A simple way to prove it to yourself is to go to any reloading manual and choose two loads with similar ejecta weight and load one with a velocity under 1200fps and near max pressure, say 10,000psi. Then find a similar load going say 1250+fps with similar pressure. Then, and this is important, have a friend load your gun with the test rounds, different loads in each barrel then hand it to you with the action closed. You will of course have marked the rounds to identify them then all you have to do fire the gun twice and compare the recoil. Pressure stresses the metal and recoil hammers the face of the stock and you.

Tom Flanigan · 05-08-2018, 09:56 PM

Anyway, pressure DOES NOT affect recoil velocity does. A simple way to prove it to yourself is to go to any reloading manual and choose two loads with similar ejecta weight and load one with a velocity under 1200fps and near max pressure, say 10,000psi. Then find a similar load going say 1250+fps with similar pressure. Then, and this is important, have a friend load your gun with the test rounds, different loads in each barrel then hand it to you with the action closed. You will of course have marked the rounds to identify them then all you have to do fire the gun twice and compare the recoil. Pressure stresses the metal and recoil hammers the face of the stock and you.[/QUOTE]

That would be an interesting test to perform and might prove the point, but probably not conclusively. Pure scientific data would prove one way or the other, but I would be willing to accept the results of your experiment. At this point, I tend to lean toward your explanation. It sounds solid.