RBHarter
West Central AR
Let preface this with let's let this be a tales of aggrevation, common solutions I've forgotten about and presume I've tried the most common solutions .
For this adventure I have 3 common as dirt rifles . A 96' Mauser in 257 Roberts, a 98' in 358 Win.
In the past I had a Savage that behaved in the same way that the Mausers are and it turns out it was extremely case sensitive, like the 1.5 gr heavy or light case meant a flier over there 3" touchy. So I'm not ruling out that as a probability I just can't do anything about it at this point as I'm waiting on brass and tools I should have had already.
So the 358 with a healthy snort of H322 I don't have that number in hand and a bullet that looks like a 35-200 or 358-200 but weighs 220 gr GC and lube or the 358 XCB ,which is what this is chambered for will put 2 rounds touching to 1.5 inches at 50 and 100 . Now I have test lots of brass that were preformed but not 1 piece of OM 358 Win. I formed some from a weigh lot of somebody else's wildcat that is no longer in service 280 something. That gave me 20 pieces of brass from 06' with finished dimensions that should be ideal to this chamber . H322 isn't the optimum powder but 3031 and 4895 aren't present and the next step is 4350 and 4831 from there W857 . None of which explains why 2-3 of 5 will hit close and the others are like roaches in the light .
The action is epoxy bedded with full free float and uniform screw tension. 1 bug here is the floor plate release is inside the trigger guard and with start loads will release under recoil higher loads it doesn't. I doubt this has any significant effects but I'll throw it out there . Lastly the bbl was installed by a very capable smith of known quality and the bbl is of known good quality, again me without my notes.
The 96' was lapped, squared and placed in a Boyds Prairie Hunter with 1 of the last A&B bbls sold by Midway. It is also epoxy bedded with cross bolts . It was built ground up as a cast shooter . With the very generous magazine length seating is to 2.790 with both a Sierra 100 gr Pro Hunter and NOE 260-120 fp which is touching the cast and not the Sierra. Modest loads ,starting at 37.5 and going to 41.5 IMR 4350 have tossed bullets around with a lucky pair being within 3" . I've changed the scope out and if that doesn't help this 8x57 converted brass will be abandoned and a box of NOS Winchester 7x57 sacrificed . The cast load of 9.5 gr of Unique with the plain base were as bad as the jacketed loads . I'll have checks today I hope . The stock had moved also and was touching at the tip that was corrected as well . The builder is in wet country I'm not so it is very likely that the 2 yr it has set in a 17% humidity environment allowed the stock to move by drying.
I don't know that there is so much a question as observations and hope that I'm going the right direction.
For this adventure I have 3 common as dirt rifles . A 96' Mauser in 257 Roberts, a 98' in 358 Win.
In the past I had a Savage that behaved in the same way that the Mausers are and it turns out it was extremely case sensitive, like the 1.5 gr heavy or light case meant a flier over there 3" touchy. So I'm not ruling out that as a probability I just can't do anything about it at this point as I'm waiting on brass and tools I should have had already.
So the 358 with a healthy snort of H322 I don't have that number in hand and a bullet that looks like a 35-200 or 358-200 but weighs 220 gr GC and lube or the 358 XCB ,which is what this is chambered for will put 2 rounds touching to 1.5 inches at 50 and 100 . Now I have test lots of brass that were preformed but not 1 piece of OM 358 Win. I formed some from a weigh lot of somebody else's wildcat that is no longer in service 280 something. That gave me 20 pieces of brass from 06' with finished dimensions that should be ideal to this chamber . H322 isn't the optimum powder but 3031 and 4895 aren't present and the next step is 4350 and 4831 from there W857 . None of which explains why 2-3 of 5 will hit close and the others are like roaches in the light .
The action is epoxy bedded with full free float and uniform screw tension. 1 bug here is the floor plate release is inside the trigger guard and with start loads will release under recoil higher loads it doesn't. I doubt this has any significant effects but I'll throw it out there . Lastly the bbl was installed by a very capable smith of known quality and the bbl is of known good quality, again me without my notes.
The 96' was lapped, squared and placed in a Boyds Prairie Hunter with 1 of the last A&B bbls sold by Midway. It is also epoxy bedded with cross bolts . It was built ground up as a cast shooter . With the very generous magazine length seating is to 2.790 with both a Sierra 100 gr Pro Hunter and NOE 260-120 fp which is touching the cast and not the Sierra. Modest loads ,starting at 37.5 and going to 41.5 IMR 4350 have tossed bullets around with a lucky pair being within 3" . I've changed the scope out and if that doesn't help this 8x57 converted brass will be abandoned and a box of NOS Winchester 7x57 sacrificed . The cast load of 9.5 gr of Unique with the plain base were as bad as the jacketed loads . I'll have checks today I hope . The stock had moved also and was touching at the tip that was corrected as well . The builder is in wet country I'm not so it is very likely that the 2 yr it has set in a 17% humidity environment allowed the stock to move by drying.
I don't know that there is so much a question as observations and hope that I'm going the right direction.
