jfh
Member.
WARDO88 and Nematocyst: Thank you. We all have our orifices, and I am always willing to share my opinions if not my orifices.
Isufan1971: I'm glad to hear that there is some 'real world' information around about SD gun porting. You are probably in a good spot to give us some 'objective' information on it.
As for ammo to test. There are three rounds, maybe four, that people are interested in, I suspect:
Since ported barrels work best with higher pressure, that does suggest the lighter-bullet / faster velocity rounds, so you may want another 38+P / ca. 110-gr round (I'm not up to speed here) that is very fast. Does MagTech have one? I also suggest you choose one round for acclimation / familiarization--say the Hornady 110-gr CD round--and shoot that almost exclusively until you have really "thought through" the recoil and muzzle flip impulse.
When I was working on the "replica reloads" effort, I found I had to repeatably shoot the reference round when I was sorting out powders to find the one most like the 38+P GDSB 135-gr. round recoil impulse. The problem is our mental adaptation, I think--that is, if we shoot more than perhaps ten rounds of a new parameter, we lose track of the subjective characteristics of the reference round. Be sure to record your thoughts immediately, too--on the target, preferably, or in the bench log.
Plan on shooting no more than two more different rounds at any given session, interspersed with the reference round. At least, that is what I had to do to get 'good' subjective evaluation of the recoil impulse when I was finalizing the replica reloads recipes.
Finally, think your testing procedures through carefully to minimize the cost. If you get well-familiarized with your reference round, you will probably need to shoot only one cylinder / 5 rounds of the 'test' round, and then you can keep the other 15 or so on hand for carry loading. (I still have 5 or 10 of the BB20As on hand--if only to put in for wintertime carry.)
Keep us posted, Isufan1971.
Jim H.
Isufan1971: I'm glad to hear that there is some 'real world' information around about SD gun porting. You are probably in a good spot to give us some 'objective' information on it.
As for ammo to test. There are three rounds, maybe four, that people are interested in, I suspect:
1. Speer 38+P 135-gr. GDSB (860-900 fps)
2. Buffalo Bore 20A; (158 gr, 1000+ fps)
3. Buffalo Bore 20B; (125 gr, (1050+fps), and
4. Buffalo Bore 20C (158 gr, 850+)
2. Buffalo Bore 20A; (158 gr, 1000+ fps)
3. Buffalo Bore 20B; (125 gr, (1050+fps), and
4. Buffalo Bore 20C (158 gr, 850+)
Since ported barrels work best with higher pressure, that does suggest the lighter-bullet / faster velocity rounds, so you may want another 38+P / ca. 110-gr round (I'm not up to speed here) that is very fast. Does MagTech have one? I also suggest you choose one round for acclimation / familiarization--say the Hornady 110-gr CD round--and shoot that almost exclusively until you have really "thought through" the recoil and muzzle flip impulse.
When I was working on the "replica reloads" effort, I found I had to repeatably shoot the reference round when I was sorting out powders to find the one most like the 38+P GDSB 135-gr. round recoil impulse. The problem is our mental adaptation, I think--that is, if we shoot more than perhaps ten rounds of a new parameter, we lose track of the subjective characteristics of the reference round. Be sure to record your thoughts immediately, too--on the target, preferably, or in the bench log.
Plan on shooting no more than two more different rounds at any given session, interspersed with the reference round. At least, that is what I had to do to get 'good' subjective evaluation of the recoil impulse when I was finalizing the replica reloads recipes.
Finally, think your testing procedures through carefully to minimize the cost. If you get well-familiarized with your reference round, you will probably need to shoot only one cylinder / 5 rounds of the 'test' round, and then you can keep the other 15 or so on hand for carry loading. (I still have 5 or 10 of the BB20As on hand--if only to put in for wintertime carry.)
Keep us posted, Isufan1971.
Jim H.
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