I have a custom rifle coming in 240 Gibbs. It's present standard load is 62.5grs of H4831SC with a 75gr moly V-MAX. It has a 30" barrel, and in reading up on the 240 Gibbs, it was created before we had the assortment of slow-burning powders available today. I'm wondering if anyone loads this caliber (or similar 6mm-06, 240 Wby, etc) with Rel 25, Retumbo, or H1000? I'm wanting to create a long-range Coyote rig.

Beibs:

I shoot the 6mm-06,28" barrel, and have been using IMR4831/87Hornady HPBT, zeroed @400yds. Vels are 3600-3650. Sorry no experience with the other powders you listed.

Jerry

Jerry, thanks. I like the 6mm rounds better than the smaller calibers. A little more confidence on windy days.

I have one load only I use in my 26" barreled 240 Gibbs.
A 95 grn nosler ballistic tip and H870. The rifle is throated to seat the bullet out to an OAL of 3.340.
Vel is 3440 fps and on an ohler strain gauge it came out to 61,000 psi. I think it's the only rifle I own I have a one load for everything in!

The load for this one is 3.13 OAL. I'll have to see where that is in relationship to the lands. Many of the 6mm rounds seem to shoot best at .10-.20 into the lands.

Never played with the 240Gibbs. I did have a 240PDK. Pretty much the gibbs plus a couple grains. I used a 40deg little less taper and 280 brass. I only had a 26" and was using Nosler 70 and 80gr. I found I could get higher velocity with Norma MRP and 7828 than I could with RL-25.

Just checking QL using your bullet and a 30 the top powders it suggests are:

Cartridge : .240 Gibbs
Bullet : .243, 75, Hornady V-MAX 22420
Useable Case Capaci: 64.720 grain H2O = 4.202 cm³
Cartridge O.A.L. L6: 3.130 inch = 79.50 mm
Barrel Length : 26.0 inch = 660.4 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 63000 psi, or 434 MPa
or a maximum loading ratio or filling of 110 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

17 loads produced a Loading Ratio below user-defined minimum of 75%. These powders have been skipped.
Powder type Filling/Loading Ratio Charge Charge Vel. Prop.Burnt P max P muzz B_Time
% Grains Gramm fps % psi psi ms
--------------------------------- -----------------------------------------------------------------
Vihtavuori N570 110.0 69.2 4.48 3840 94.0 61176 15109 1.067 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-25 108.0 64.1 4.15 3840 100.0 63000 13325 1.048 !DANGEROUS LOAD-DO NOT USE!
Norma MRP 100.1 62.3 4.04 3838 99.7 63000 13857 1.056 !DANGEROUS LOAD-DO NOT USE!
Vihtavuori N560 101.9 62.1 4.02 3832 97.6 63000 14133 1.050 !DANGEROUS LOAD-DO NOT USE!
IMR 7828 SSC 100.7 61.7 4.00 3826 98.0 63000 13748 1.039 !DANGEROUS LOAD-DO NOT USE!
IMR 7828 106.4 61.7 4.00 3826 98.0 63000 13748 1.039 !DANGEROUS LOAD-DO NOT USE!
Ramshot Magnum (Big Boy) 104.1 66.5 4.31 3823 98.5 63000 13833 1.047 !DANGEROUS LOAD-DO NOT USE!
Norma MRP 2 110.0 65.6 4.25 3823 98.5 62755 14093 1.064 !DANGEROUS LOAD-DO NOT USE!
PB Clermont PCL 517 104.5 66.5 4.31 3822 98.5 63000 13819 1.047 !DANGEROUS LOAD-DO NOT USE!
SNPE Vectan SP 12 104.3 66.4 4.30 3822 98.6 63000 13800 1.047 !DANGEROUS LOAD-DO NOT USE!
ADI AR 2213 101.7 61.3 3.97 3810 97.9 63000 13603 1.037 !DANGEROUS LOAD-DO NOT USE!
Accurate MAGPRO 102.0 64.7 4.19 3809 96.3 63000 14112 1.060 !DANGEROUS LOAD-DO NOT USE!
Bofors RP5/NP ~approximation 102.2 61.6 3.99 3806 98.9 63000 13641 1.055 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-22 102.2 61.6 3.99 3806 98.9 63000 13641 1.055 !DANGEROUS LOAD-DO NOT USE!
Raufoss RA15 102.2 61.6 3.99 3806 98.9 63000 13641 1.055 !DANGEROUS LOAD-DO NOT USE!
Winchester WXR 104.9 61.9 4.01 3803 98.9 63000 13644 1.056 !DANGEROUS LOAD-DO NOT USE!
ADI AP 2214 105.3 65.2 4.23 3790 98.3 63000 13360 1.038 !DANGEROUS LOAD-DO NOT USE!
ADI AR 2209 98.7 58.6 3.80 3773 98.8 63000 13023 1.039 !DANGEROUS LOAD-DO NOT USE!
Rottweil R905 103.4 61.2 3.97 3769 97.5 63000 13305 1.053 !DANGEROUS LOAD-DO NOT USE!
Winchester 760 89.6 56.6 3.67 3767 99.6 63000 12829 1.052 !DANGEROUS LOAD-DO NOT USE!
Hodgdon H414 89.6 56.6 3.67 3767 99.6 63000 12829 1.052 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-19 99.2 59.2 3.84 3766 98.8 63000 13068 1.048 !DANGEROUS LOAD-DO NOT USE!
Alliant Reloder-17 87.5 54.8 3.55 3765 100.0 63000 12111 1.038 !DANGEROUS LOAD-DO NOT USE!
Ramshot Hunter 94.8 58.4 3.78 3761 99.9 63000 12714 1.054 !DANGEROUS LOAD-DO NOT USE!
Bofors RP14 ~approximation 99.9 59.6 3.86 3757 98.8 63000 12964 1.049 !DANGEROUS LOAD-DO NOT USE!
Bofors RP5 NT ~approximation 105.2 64.0 4.15 3756 96.0 63000 13287 1.042 !DANGEROUS LOAD-DO NOT USE!
Hodgdon H1000 110.0 64.9 4.21 3756 98.0 61302 13254 1.051 !DANGEROUS LOAD-DO NOT USE!

Paul, wow...that really puts out some information! Thanks...that'll save me some time.

Jon