9.3x62 stringing load vertically.

[Mr Humble]

Not a lot of CB data for this but used a 35 Whelen load. 285 .366 GC (bought from member), Privi Brass, WW LR, 30 gr 4759, 14 cornmeal, Rifle Savage 116 (made for export), 2-7 USA Burris w/2" lee dot and fch. Rifle will shoot nice round groups under 1" with any jacketed bullet and 1/2 gr< max 3031 or 4064 loads.

Fired 7 @ 50 yds with CB load, #1 3" low, 3" left, #2 12 0 clock 3" high #s 3-7 went straight up, each cutting the previous with 6&7 almost in the same hole.

The same bullet has not done well at all with 2400, Unique, 4227 or trail boss, so I may be "on the trail", but something is still amiss.

Thoughts ? Thanks.

[waksupi]

Try reducing the load a bit, and slowing down on rate of fire. I find some marginally sized boolits will start to string vertically as the barrel heats and expands.

[9.3X62AL]

I would agree with Ric's recommendations. 23.0 grains of 2400 gives 1700 FPS and consistent sub-1.5 MOA work from my CZ-550 with boolits of 270 grains/sized .367". Kick them out at 2000-2100, and the first 3-4 will behave, but the group opens up from there until the barrel settles down (20 minutes), and the first 3-4 after the wait go right back into the group.......and go galley-west AGAIN if the shooting continues. This isn't a varmint caliber, so such behavior as a practical matter can be lived with for big critter venues.......but it still isn't tractable like the slower loads are.

I have loads ready with a better lube, and will experiment with boolit scaling to see if either tweak has an effect.

[Mr Humble]

Excellent point as the bullets are right at .367 and case mouth belling is not needed. Bought a new 2 cavity 9.3 mold and gas checks in the last group buy here and plan to do some casting this winter when it's too windy to fish or dive.

[waksupi]

Size to .368 if possible, and see if that doesn't cure the wandering boolit syndrome. If they are marginal as they are, this may cure it. I know Shuz and Pilgrim run their Whelens in the 2200fps neighborhood, with heavy boolits.

[swheeler]

Me,I'd trade the 14 grs of cornmeal for 1 gr of dacron for filler.

[Mr Humble]

Tried both, dacron works fine too, but no better and you can't run it thru a Lyman 55 measure.
"Love the smell of cornmeal in the morning" (sorry Robert)

[waksupi]

Excellent point as the bullets are right at .367 and case mouth belling is not needed. Bought a new 2 cavity 9.3 mold and gas checks in the last group buy here and plan to do some casting this winter when it's too windy to fish or dive.

Not belling the case just registered on me. Do you mean the boolits are a loose slip fit after sizing, or before? What you need is a fairly tight slip fit in a fired case. Fit to the throat, and I think you will have a whole new accuracy ball game going on. I will say now that it is definitely an undersize boolit problem.

[nanuk]

are you cleaning your barrel then shooting these types of groups?

how hot is your barrel getting during the shooting?

[Mr Humble]

No, I don't clean it because the old cast bullet/jacketed bullet myth (with a good barrel) has been disproven so many times, it's right up there with the "Microgrooves won't shoot cast bullets" myth. IME Savages, with the Accubed system, are always sub MOA rifles.
The barrel from Savage is short (20") fat and insofar as I know the only factory barrel that is Nitririded. (These were all built for export, 4 escaped, 2 8x57, 2 9.3x62) I bought it because I love the cartridge, I respect Savage, I like detachable magazines and (mostly) because the way it looks just winds up so many people who have yet to figure out Ungulates are color blind.

As bought:

http://i1186.photobucket.com/albums/z377/rocketcity1/tororeelmower18/0e4c02dd.jpg

As "improved" (the more orange the better)

http://i1186.photobucket.com/albums/z377/rocketcity1/tororeelmower18/960159fb.jpg

[swheeler]

No, I don't clean it because the old cast bullet/jacketed bullet myth (with a good barrel) has been disproven so many times, it's right up there with the "Microgrooves won't shoot cast bullets" myth. IME Savages, with the Accubed system, are always sub MOA rifles.
The barrel from Savage is short (20") fat and insofar as I know the only factory barrel that is Nitririded. (These were all built for export, 4 escaped, 2 8x57, 2 9.3x62) I bought it because I love the cartridge, I respect Savage, I like detachable magazines and (mostly) because the way it looks just winds up so many people who have yet to figure out Ungulates are color blind.

As bought:

http://i1186.photobucket.com/albums/z377/rocketcity1/tororeelmower18/0e4c02dd.jpg

As "improved" (the more orange the better)

http://i1186.photobucket.com/albums/z377/rocketcity1/tororeelmower18/960159fb.jpg

Humble; carry that over your shoulder and you don't need an orange vest! I have to go now, my eyes hurt:)

[9.3X62AL]

As stated earlier.....I still have a few tricks to try before giving up on the high velocity inquiry with the 9.3mm. I'm with Ric in thinking you've got an undersized boolit sitch going on here.

I saw the ads for these Euro variants in 8mm and 9.3mm, and wondered if any would make their way into the USA/Canada market. Both are excellent game calibers, and the 9.3mm has gained a few more bullet designs since I got my CZ-550 in 2002. One hint.....for j-words, the Nosler 250 grainer can be run to the same speed and trajectory of the 30-06/180 grain spitzer--but it hits at any range with half-again the striking energy. Just sayin'........