I've been wanting one of those bore scopes, but after reading this entire thread, I'm now thinking it could be better NOT to know sometimes!
In any event, clearly one could use the KISS principle here with this load and that barrel: Go forth to slay heaps of critters at any half-way reasonable range!
All published 9,3x62 loading data is based on old, low-pressure standards. I have NEVER run into any sort of "pressure sign" by starting with published maximums and working up to around 2450-2500 fps with 286s and 2650-2700 fps with 250s, of whatever brand. That's with three different 9.3x62s hat had 21-24 inch barrels.
No doubt it could be pushed even harder, but have generally found 250s and 286s at those velocities kill big game VERY well.
Those bullets touching groups is impressive. No medium bore hunter ever needed a match grade barrel. They are not finicky. To the guy who said back in the thread: rebored with "dull tools". Quite a theory there. Has it ever occurred to you that certain steels are cleaner/easier to rebore than others?
Again, superb accuracy SU35. Best $225 you could've spent.
All published 9,3x62 loading data is based on old, low-pressure standards. I have NEVER run into any sort of "pressure sign" by starting with published maximums and working up to around 2450-2500 fps with 286s and 2650-2700 fps with 250s, of whatever brand. That's with three different 9.3x62s hat had 21-24 inch barrels.
No doubt it could be pushed even harder, but have generally found 250s and 286s at those velocities kill big game VERY well.
My experience as well.
I'm not saying anyone is unsafe, just using their data as a reference. Maybe I'll see about how temp stable they are and contact them and find out what pressure they're loading to.
N540 is a very good powder--especially these days. While Vihatvuori powders have always been accurate and pretty temperature resistant, but more recently they've all been temp-resistant, and include decoppering agents.
N540 is a very good powder--especially these days. While Vihatvuori powders have always been accurate and pretty temperature resistant, but more recently they've all been temp-resistant, and include decoppering agents.
Originally Posted by Dre
That power ain’t cheap $300 for 8lbs or $40/1 lb
I just did a quick check for the wholesale price at Graf & Sons - $36/pound for the N540 compared to $23/pound for PP 2000-MR. Based on 2000-MR's performance in the 35 Whelen AI (almost identical capacity to the 9.3x62) I bet it's going to be a touchdown with 250 and 286 bullets in the 9.3. Our member, mainer_in_ak has had great luck with it.
13 Years Hunting Alaska with the 9.3x62 Sorry if this is taking the rifling subject too far off topic... I was hoping to take the 338-06 that Jesse just rebored for me (I posted borescope pics of its barrel earlier in the thread) to the range this morning but it's looking a little too rainy. Hopefully either tomorrow or Sunday. It's loaded up with some 225 and 250 grain Hornadys and 2000-MR and Varget. Cheers, Rex
N540 is a very good powder--especially these days. While Vihatvuori powders have always been accurate and pretty temperature resistant, but more recently they've all been temp-resistant, and include decoppering agents.
Originally Posted by Dre
That power ain’t cheap $300 for 8lbs or $40/1 lb
I just did a quick check for the wholesale price at Graf & Sons - $36/pound for the N540 compared to $23/pound for PP 2000-MR. Based on 2000-MR's performance in the 35 Whelen AI (almost identical capacity to the 9.3x62) I bet it's going to be a touchdown with 250 and 286 bullets in the 9.3. Our member, mainer_in_ak has had great luck with it.
13 Years Hunting Alaska with the 9.3x62 Sorry if this is taking the rifling subject too far off topic... I was hoping to take the 338-06 that Jesse just rebored for me (I posted borescope pics of its barrel earlier in the thread) to the range this morning but it's looking a little too rainy. Hopefully either tomorrow or Sunday. It's loaded up with some 225 and 250 grain Hornadys and 2000-MR and Varget. Cheers, Rex
I've read that Pw Pro 2000-MR is very close to CFE-223. I'm not sure if 2000-MR has the same anti fouling formula of CFE-223.
N540 is a very good powder--especially these days. While Vihatvuori powders have always been accurate and pretty temperature resistant, but more recently they've all been temp-resistant, and include decoppering agents.
Originally Posted by Dre
That power ain’t cheap $300 for 8lbs or $40/1 lb
I just did a quick check for the wholesale price at Graf & Sons - $36/pound for the N540 compared to $23/pound for PP 2000-MR. Based on 2000-MR's performance in the 35 Whelen AI (almost identical capacity to the 9.3x62) I bet it's going to be a touchdown with 250 and 286 bullets in the 9.3. Our member, mainer_in_ak has had great luck with it.
13 Years Hunting Alaska with the 9.3x62 Sorry if this is taking the rifling subject too far off topic... I was hoping to take the 338-06 that Jesse just rebored for me (I posted borescope pics of its barrel earlier in the thread) to the range this morning but it's looking a little too rainy. Hopefully either tomorrow or Sunday. It's loaded up with some 225 and 250 grain Hornadys and 2000-MR and Varget. Cheers, Rex
I've read that Pw Pro 2000-MR is very close to CFE-223. I'm not sure if 2000-MR has the same anti fouling formula of CFE-223.
DF
Speer's recent data indicate they are pretty close in the Whelen (they're the top 2 powders), with 2000-MR slightly edging our CFE-223. I have not used the CFE-223. Speer 35 Whelen 250 HotCor data And while copying that link I found they have run it in the 9.3x62 with their 270 HotCor as well: Speer 9.3x62 270 HotCor data It's less of a standout in Speer's 9.3 data than I'd have expected. Cheers, Rex
Sorry I posted before reading the entire thread. Glad it turned out to be a winner. I think it is interesting that Chrome Moly is likely to have more impurities or occlusions than stainless. And what I am gathering is that hammer forging can push these occlusions away from the immediate surface of the lands and grooves but not by much. A re-bore can uncover them again. Is this correct?
I am in the camp where I might be better off with out a bore scope so I don't obsess about minutia anymore than I already do.
"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli
N540 is a very good powder--especially these days. While Vihatvuori powders have always been accurate and pretty temperature resistant, but more recently they've all been temp-resistant, and include decoppering agents.
Originally Posted by Dre
That power ain’t cheap $300 for 8lbs or $40/1 lb
I just did a quick check for the wholesale price at Graf & Sons - $36/pound for the N540 compared to $23/pound for PP 2000-MR. Based on 2000-MR's performance in the 35 Whelen AI (almost identical capacity to the 9.3x62) I bet it's going to be a touchdown with 250 and 286 bullets in the 9.3. Our member, mainer_in_ak has had great luck with it.
13 Years Hunting Alaska with the 9.3x62 Sorry if this is taking the rifling subject too far off topic... I was hoping to take the 338-06 that Jesse just rebored for me (I posted borescope pics of its barrel earlier in the thread) to the range this morning but it's looking a little too rainy. Hopefully either tomorrow or Sunday. It's loaded up with some 225 and 250 grain Hornadys and 2000-MR and Varget. Cheers, Rex
I've read that Pw Pro 2000-MR is very close to CFE-223. I'm not sure if 2000-MR has the same anti fouling formula of CFE-223.
DF
Speer's recent data indicate they are pretty close in the Whelen (they're the top 2 powders), with 2000-MR slightly edging our CFE-223. I have not used the CFE-223. Speer 35 Whelen 250 HotCor data And while copying that link I found they have run it in the 9.3x62 with their 270 HotCor as well: Speer 9.3x62 270 HotCor data It's less of a standout in Speer's 9.3 data than I'd have expected. Cheers, Rex
Oh, I should have realized - Speer loaded the Whelen to its SAAMI spec of 62K PSI and then did the same for the Nine-Three with its CIP spec of 57K PSI. I think I will take Mule Deer's advice and start near Speer's 9.3 max and work up to 2500 FPS or so - shouldn't take too much [EDIT: that's with the 270 HotCor which are pretty cheap for initial load playing in my as yet unfired JES rebore.]. If my experience with the 35 Whelen AI (almost identical case capacity to the 9.3x62) 2000-MR ought to produce an extra 100 FPS or so over what has been traditionally achieved with max loads - but as MD says - no real need to push this round beyond his guidance below: Quote from Mule Deer
Quote All published 9,3x62 loading data is based on old, low-pressure standards. I have NEVER run into any sort of "pressure sign" by starting with published maximums and working up to around 2450-2500 fps with 286s and 2650-2700 fps with 250s, of whatever brand. That's with three different 9.3x62s that had 21-24 inch barrels.
No doubt it could be pushed even harder, but have generally found 250s and 286s at those velocities kill big game VERY well. Cheers,
I finally got to shoot my JES re-bored 9.3x62 1903 Springfield today. I just found out today is the last day our county range is open. They close tomorrow UFN because of the staff being limited by Coronavirus sequestration. I spent the last week or so getting it very neutrally bedded, free floated, and a Leupold M8 4X Compact mounted in NOS Buehler rings & base. I set the windage on the scope to the center value and then used the rear base screws to get it boresighted on my 100 yard target. Then I fired three rounds of Lapua factory 285 gr Megas. I got lucky with the boresight as the elevation was right on POI and the azimuth was less than 2 inches left. I was thrilled to see the second round land just over a half inch from the first, and the third just cut the second on the inside edge, for a 0.59" group. Not just the first group fired with this rifle since its rebore, but the first three shots ever fired with it! I made some scope adjustments and then started working with my handloads, working up to JB's 250 AB / Varget combo. Today I had 58, 59, and 60 grains loaded up, and the three groups I shot with these went 0.65", 0.65", and 0.70" respectively, and that is with making a scope adjustment with the old M8 friction dials between each group. I am really happy with this rig so far and will do my best to really finish it out (stock and metal) nicely. Recall I posted borescope pictures back on page 3 or 4 of this thread with a line of 3 little gouges I found along the same edge of one groove. In subsequent looks with the scope I found three more little boo boos along the same edge. They certainly don't hurt a thing so I really wanted to post these results to support the "revealing" aspect of the OP's experience of getting great performance from his pretty bad looking barrel. I just hope I can get my 338-06 rebore (which has no visible flaws) shooting anywhere close to this one. Today's session with it made some progress but I have a ways to go with that one.
Another point: I imagine everyone with a JES 9.3x62 rebore has the same long throat as me, since it is integral to his reamer. Even loaded out to the max on my Springfield's 3.4 inch magazine, these 250 NABs (SPS blems) have almost a quarter inch "jump" to the lands. Clearly, that doesn't hurt a thing! My SPS blem 286 partitions (kindly sent to me by SU35, the OP) have the same jump. Speer 270 HotCors have about the shortest jump, but it's still pushing .070". Hornadys (286 SP Interlock and 250 GMX), and the Lapua 285 Mega are in the middle. I have not shot any of these except the Mega, but have measured them. I just toss this out in case it is of use to anyone. There, I have run my pie hole enough for tonight. Cheers, Rex
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