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Old August 14, 2010, 01:06 PM   #1
brmfan
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2600+ fps with RL-17 with a 190 SMK???

I've read a lot of good stuff about heavier bullets on top of RL-17 for long range out of a .308 and I'd like to work up a load for an upcoming 1000 yard F Class shoot. Problem is that most of the bullets folks have reported velocity data have been for 175's or 200+ grainers. I have yet to find a post with velocity data for a 190 SMK over RL-17 from a 24" 1:11.25 5R barrel.

So, is there any reason to think I couldn't get a solid 2600 fps with the following load:
Lapua brass
CCI BR2 primer
190 SMK
48-49 grains RL-17

I know 190's may not be the BEST choice, but summer vet bills this year were way more than I had expected so I'd like to make use of the powder and bullets I currently have on hand. Later on I'll probably splurge and try some Berger 185's, but for now if I can use the 190 SMKs I'd like to give it a try.

Thanks!
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Old August 14, 2010, 01:10 PM   #2
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I have some serious doubts that you can get them up to 2600 fps with a 24" barrel but who knows.
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Old August 14, 2010, 01:12 PM   #3
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You are running into the point where the 308 cannot keep up with the 30-06 because of case capacity. Long bullets take up case capacity to the point where they interfere with velocity.

Lyman says you can reach 2,600 fps with the 190 gr bullet using H380, N550, and Varget, but all of them are compressed loads. I don't know it you can get there with Rl17.
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Old August 14, 2010, 01:25 PM   #4
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Quote:
Lyman says you can reach 2,600 fps with the 190 gr bullet using H380, N550, and Varget, but all of them are compressed loads. I don't know it you can get there with Rl17.
Is that with a 24" barrel?
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Old August 14, 2010, 02:09 PM   #5
brmfan
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FWIW, I found a thread on another site where a 208 AMAX was being consistently pushed just over 2600 fps with 50 grains of RL-17 (Win brass), CCI 200 primer, out of a 20.5" 1:12 barrel.

I assumed that the additional 3.5" of barrel length + 18 grain lighter bullet I would be using would yield a ballpark 2600fps for the 190s if I backed off a powder grain or two.
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Old August 14, 2010, 02:33 PM   #6
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Well thats awesome if it can be done safely.
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Old August 14, 2010, 04:26 PM   #7
brmfan
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What I'll probably do is fire form some Win brass instead of using the Lapua. The extra case volume should give a lighter compression (although I do seat them out pretty far since F-TR requires you to load one at a time) and should keep the pressure at a safe level.
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Old August 15, 2010, 07:25 PM   #8
5R milspec
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hey I too have a 5R.and I am also one of the guys who is shooting the 208gn A-max with R17.for me I worked up starting at 46gn of R17 to 48gn.but after shooting the 48gn load and looking at the primers I stuck with the 47.5gn load.I am all so loading the bullets long just into to the lands.but I cannot give you the FPS with the load.but seem to think I am around 2600fps with the 208gn A-max.

so I would just work up a ladder test and just see what happens with the 190gn bullet.would think that 48-49gn would be a safe charge weight.but hey I am just guessing at this.
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Old August 15, 2010, 11:23 PM   #9
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5R: Good info. Thanks!
What case & primer are you using? I'd like to use the Lapua brass that I have already fire formed, but I may have to prep some Winchester in order to get more case volume. I know I'll have to compress the load to some degree, but I want to keep it as light as possible.
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Old August 18, 2010, 05:15 AM   #10
escard
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maybe I had been wrong for many years picking a 30-06/180 grs hunting load running only at 2750 fts while I could have a neat small .308 driving as fast as 2600 fts with a 208 grainer..........???
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Old August 18, 2010, 09:30 AM   #11
Brian Pfleuger
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Using a slightly increased case capacity of 57.5hr H2O (which is generally more accurate), QuickLoad thinks that the max load of RL-17 under a 190gr SMK would be 46.9gr @ 70F, assuming a default OAL of 2.800. It thinks this load would produce 2668fps from a 24" barrel.

Note that this is highly speculative without matching the inputs to the exact gun, case, powder lot and other variables and should not be relied on for a safe load.
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Old August 18, 2010, 06:18 PM   #12
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I doubt it. My rifles pierces primers when I push a 190 much over 2550 fps.
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Old August 18, 2010, 06:33 PM   #13
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I am useing Lapua brass.even a BR-2 primer with my load.but will say that the necks are getting a little hard so I am going to have too anneal the necks before I can shot the load again.but will say that the load is shooting really great for me.last time out before it got to hot for me I shoot a 1.5" group at 300 yards.( 20 shoot group)thats when I came to think the necks are to hard and need annealing.will try to get back at the range ASAP to see if the annealed necks show a better group or not.just been to hot for me around here to shoot.and that I sweat like a stuck hog.
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Old August 18, 2010, 09:20 PM   #14
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5R: Trust me... I know exactly what you mean! That's good info, thanks!
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