Another pressure load / recoil question

358Scout

358Scout

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Does pressure determine recoil?
NOTE: these loads are for International Competition not ATA

I have a 12g load at 1350 fps with a pressure of 10,000 PSI out of a Winchester AA hull. All things exactly the same except now with a Federal Gold hull, the pressures now drop to 8,000.

Now I'm thinking if I shoot doubles out of my O/U where one barrel is modified and the other full - would it be to my advantage to use the lower pressure shell in the second shot through the full choke since the shot wad is going to be compressed more thus resulting in a higher pressure build up.

I'm assuming the recoil would be less???????
 
Pressures are absolutely no indication of recoil, as the .410 shotgun has more pressure then the 12 gauge. The load you mention differs simply because the Federal hull has much more internal capacity then the AA and therefore lower pressure, I'm pretty sure the fed. load would have lower velocity however.
 
Sorry - yes I checked again it does have a lower velocity by 50 FPS. Another question. What use is the pressure figures for loads in shotguns?
 
Pressure figures are important so that you do not go over max. causing damage to the cases and possibly the gun/shooter. When shotgun pressures were given in LUP , 12 gauge loads did not go over 11K, now with psi I'm not sure how that translates. Loads that are over pressure will usually show with the spent primer becoming loose and falling out of shell and into the action in some cases, binding up the gun, you don't want to go there. Even if the primer stays in the case through the firing and ejecting, it will not be useful again as a new primer would be a loose fit.
 
When loading for shotguns yes higher chamber does result in more felt recoil it will also cause blown patterns this means you will have holes in your patterns pattern density is what breaks targets ideally you want to load the highest fps with the lowest chamber pressure choke has nothing to do with pressure. 16yd ata targets can easily be busted with 1oz 1,100 fps loads with pressures down to 7500 if you have ever competed in 500 singles marathons fatigue from recoil is why you miss targets not velocity. If your shooting handicap from the 24yd line or further or international trap then you do have to increase FPS do to the further distance and in the case of international trap faster and harder targets .
 
Pressue does not have effect on recoil!

Notes from HODGDON reloaders manual:

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The question of felt recoil and what influences it gets interesting. I think there is a correlation between amount of perceived recoil and pressure because faster loads, which generally are related to higher pressures, will yield more recoil. So one quite naturally, and wrongly, thinks pressure is a factor influencing recoil. The biggest change in recoil I have noticed with shotgun occurred when dropping to 1 ounce loads. This is at least partly explainable from the formula provided, of course. On the other hand, I find muzzle blast to be very much a part of felt recoil and fatigue when shooting rifle, much as Hodgdon is saying. But I've been going along with shotgun, so far, not noticing muzzle blast all that much, even with a fairly short barrel (28 inches).
 
Fred

If you are loading shell for Intl. they are supposed to be 24grams, or 7/8oz. I have loaded and shot many thousand of them, and relatively speaking they are a light recoiling shell.
Red dot was the powder of choice, or 452AA. FS
 
Yes, I am sure that 7/8 oz provides even less recoil, all things being equal. Just haven't graduated to loads that light yet or International for that matter. Probably going to try both before it's over. I have found that I don't have large holes at 35 yards using a full choke and 1 oz of 7.5 coming out around 1180 or so. It is the load I'm using in practice. Any match will find me back up to 1 1/8 oz., but I keep the velocity down to around 1145. That all might change if I ever get back to the 27 yard line. If you detect a bit of fuzz in this approach you're absolutely correct. Haven't settled on exactly the loads I'm going to stick with. So, it's a work in progress, really. I also have to shoot my way through several boxes everytime I change. One consideration is that I don't want to drop too far in pressure and get ignition problems and I don't want so much velocity that my groups start looking bad. So, I'm still kind of feeling my way. Hasn't seemed to make a big difference in skeet. Throw anything that has lots of teeny tiny pieces of shot :) and my scores stay the same. Shot doesn't have to be going too fast. It doesn't even seem to matter when the shot is horribly deformed. Haven't seen much reason to choose between Clays, Tightwad, Red Dot and Hi Skor powders in terms of recoil or grouping either. I did find Hi Skor to leave more powder unburnt in the barrel compared to Red Dot this winter. But it is just fine when the temperature is a little higher.
 
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