Has anyone tried these wide meplats with extra power mag springs? 460 rowland highly recommends extra power / heavy mag springs for proper cycling in glocks. The math seems right for the heavier bullets - faster slide due to recoil and extra power recoil springs and heavier bullets pushing on the mag spring, the mag may not be pushing the bullets up fast enough to get ahead of the slide...but if someone has tried this with these wide meplat 10mm and it still failed to feed on weak hand shots, I won't head this way.
https://www.460rowland.com/product/460-magazine-spring/
I saw you're using Lehigh bullets now but I just wanted to mention rimrock bullets. Their 200 grain bullet has a little smaller metplate and is used by Buffalo Bore.
https://rimrockbullets.com/xcart/-40...n-per-700.html
Plus they're a little cheaper at $70/700. Free shipping over $100 and they'll fit 3 boxes in a flat rate box.
That's very interesting, and looks like it's worth a try.
Here's a link to the post about my Lehigh XP load:
https://pistol-forum.com/showthread....l=1#post656227
“There is no growth in the comfort zone.”--Jocko Willink
"You can never have too many knives." --Joe Ambercrombie
I'll take a play with some of those Lehigh loads! Just loaded some of their 115's for the 9mm.
Would like to pick your brain a bit more on these 200 gr HC's as i have a batch from MBW in the works - before you swapped your spring out, did you have reliability issues at all load power levels (eg, maybe at 8grains @ 1100fps) or just at max load power? Also, did you try the weak hand / one hand reliability test with the OEM spring? I'm wondering if an OEM recoil spring with OEM mag springs (eg, forward speed of slide is mfr tuned to the upward speed of the mag spring) on a slightly lighter load would work.
@mtboz, good questions. I had FTFs with anything above .40 cal power factor, even with regular FMJ bullets. Especially WHO. The OEM RSA is very undersprung.
I didn’t try lighter hardcast loads.
The .460 mag spring is on its way, and when I get a chance I’ll test it with my hardcast bearkiller loads.
“There is no growth in the comfort zone.”--Jocko Willink
"You can never have too many knives." --Joe Ambercrombie
Update on this project:
I installed the Rowland heavy mag spring.
I was only able to get 14 rounds into a mag, and that would load only with the slide open. This probably means this is a 13+1 setup.
I fired about 100 rounds of 10mm ranging from .40 wimpy loads to full power 10mm with no issues. Wow, this gun is really shootable! I'm always impressed by how well the large frame Glocks work.
Then I loaded up some of my 200gr hardcast bearkillers. These fed well, even though the bullet was notched as it hit the ramp. That is an improvement, and is encouraging. But, after 16 rounds, the magazine started dropping free on every shot. Inspection revealed that the mag release had gouged the ledge on the magazine, preventing solid retention of the mag. Surprisingly to me this is a known issue in G20s firing .460 Rowland, and apparently can be fixed using Rowland mag shims, which are now on order.
More to come...
Last edited by Clusterfrack; 03-29-2019 at 03:43 PM.
“There is no growth in the comfort zone.”--Jocko Willink
"You can never have too many knives." --Joe Ambercrombie
@Clusterfrack - assume you are still using the 800x loads - how is your accuracy? I'm using an almost identical bullet from Montana Bulletworks (https://www.montanabulletworks.com/p...-200gr-wfn-gc/), and getting pretty ugly groups with 8.3gr Longshot @1232fps with 1.230 OAL. These loads are also hitting 3-4 inches lower at 15 yards than range ammo. Tests in both OEM and Storm Lake custom barrel show that I'm also having the feeding issues you described in your G20, so it appears that the only solution to this is to amp up the mag spring *or* go with a bullet that has more of a taper (https://www.montanabulletworks.com/p...-200gr-lfn-gc/). HSM 200 grain "Bear Load" factory ammo feeds without issue, and it looks like HSM and Buffalo Bore use a tapered bullet similar to the lfn-gc. Have you tried your wide flat bearloads in a different 10mm platform by chance?
Anyone else getting marginal accuracy with longshot?