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Post by mike on Dec 6, 2015 1:19:57 GMT -5
I have a few questions pertaining to shooting my new Hankins SPML-45 (28" barrel) with Leupold VX-6 4-24x52 mounted on 20 MOA rail:
1. Is the recommended powder charge 78 grains weighed of IMR 4198 for pushing a 275 grain Parker Match/Hunter bullet? This powder charge and bullet weight is what I've heard Jeff state in a number of his videos and on his website, but I want to confirm prior to sighting in the rifle next week just to be sure.
2. What muzzle velocity will the above combination produce?
3. If I zero the p.o.i. at 200 yards how high will the p.o.i. be at 100?
4. Based on a 200 yard zero, how low will the p.o.i. be at 250, 300, 350 and 400? Does anyone have any actual data in terms of dialing the scope elevation for these long range distances(number of MOA dialed for each distance)?
5. I've already ordered a supply of 275 grain Parker Match/Hunters, but I'm curious to know when the 300 and 327 grain Match/Hunters would be a better selection? I know the heavier bullets will maintain greater downrange energy at the expense of velocity, but what are other advantages and disadvantages? Would a powder charge greater than 78 grains of IMR 4198 be safe for these heavier bullets? If so, how much?
Sorry for so many questions, just want to be safe and follow established protocol. Thank you for any information you can offer.
Regards, Mike |
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Post by keith on Dec 6, 2015 8:11:24 GMT -5
78gn of IMR 4198 has shot about .75-1 MOA (5-shots groups) in my Hankins barreled action with the 275BE and 275MH. When you get over 300gn I shoot 70-73gn of H4198 and will try H322 and IMR 3031 today.
I was with a friend the other day while he collected data and while I don't remember for certain I think you'll use 4-5MOA of elevation to get to 300yds with the 275gn and 78gn. His MV was right at 3000fps with both the 275BE and E-MAX.
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Post by Hank on Dec 6, 2015 8:16:31 GMT -5
Mike. Here are my load recommendation for the Parker bullets.
275 grain bullet with 78 grains of IMR 4198
300 grain bullet with 75 grains of IMR 4198
327 grain bullet with 73 grains of IMR 4198
These are max loads I recommend in my rifle and they will be safe in your rifle (Mikes Rifle). I cannot say if these loads will be safe in other manufactures rifles so use the data with caution.
The 275 grain bullet will achieve 3000 fps with the listed load.
There are many other powders you can use if you can't get 4198. IMR 3031 is my second choice and it shoots just as good but it requires a little more powder to achieve the same velocities.
Drop data you will need to figure on your own rifle but when I get to the shop I'll give you my data I have for the 275 BE. Kyle has good data for other bullets as well and he will probably list it.
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Post by Deleted on Dec 6, 2015 8:21:54 GMT -5
Mike. Here are my load recommendation for the Parker bullets. 275 grain bullet with 78 grains of IMR 4198300 grain bullet with 75 grains of IMR 4198 327 grain bullet with 73 grains of IMR 4198 These are max loads I recommend in my rifle and they will be safe in your rifle (Mikes Rifle). I cannot say if these loads will be safe in other manufactures rifles so use the data with caution. The 275 grain bullet will achieve 3000 fps with the listed load. There are many other powders you can use if you can't get 4198. IMR 3031 is my second choice and it shoots just as good but it requires a little more powder to achieve the same velocities. Drop data you will need to figure on your own rifle but when I get to the shop I'll give you my data I have for the 275 BE. Kyle has good data for other bullets as well and he will probably list it. That is a screamin' load combo!! |
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Post by hillbill on Dec 6, 2015 8:45:35 GMT -5
200 yd zero with the 275 mh should be about 2" high at 100 if I remember correctly
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Post by Kyle on Dec 6, 2015 9:07:52 GMT -5
Mike,
Glad to see you on the board. I have some field proven data with my Hankins SPML that I got in August of 2014 from Jeff. My gun has a heavy Krieger .450/458 1 in 20 twist. I have a Nightforce ATACR 5x25x56mm with MOAR reticle and a Badger 20 MOA rail on it. Shooting 78gr of IMR4198 listed below is data for the 275 MH and 275BE that I have verified with my gun on many range sessions and trips to Kentucky. I established all data off off the same zero setting for both bullets at 100 yards. This works for me. Come and shoot with us in April Mike. We're here and there to help. Kyle
275BE 275MH
Yards MOA MOA
100 0.00 0.00
200 1.75 1.25
250 3.00 2.25
300 4.75 3.50
350 6.50 4.75
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Post by mike on Dec 6, 2015 10:28:17 GMT -5
Great information guys! OK, so when using the heavier bullets the powder charge is decreased. I guess this has to do with the heavier bullets causing an increase in chamber pressure and thus the need to slightly reduce the charge?
I appreciate all your assistance. Thank you.
Regards,
Mike
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Post by deadeye on Dec 6, 2015 12:15:57 GMT -5
Great information guys! OK, so when using the heavier bullets the powder charge is decreased. I guess this has to do with the heavier bullets causing an increase in chamber pressure and thus the need to slightly reduce the charge? I appreciate all your assistance. Thank you. Regards, Mike you are correct...all advice given is spot on.
start low & always work your way up for safety purposes. preferably with a chrono.
the 327mh is the wind bucking king....the 73.0gn of h4198 is a nail driver & a great long range load-especially 400+ yds ///// downfall to some=recoil
keith's bullets might give the parker 327's a run for the money.
it is my belief when you find a near perfect load for your gun the cold bore shots are spot on with the after fouling groups-just something I have noticed over the years even w/ cf's.
jmho
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