![]() If O’Connor used Winchester brass, which has significantly lower capacity than most other brands, he would naturally have higher pressures, higher velocities and possibly better accuracy as a result. 270 Winchester brass from different makers varies widely in capacity. Obviously, this load needs to be approached with caution, especially given the many changes that have taken place in the 70 years since it was first published. Speer’s Manual for Reloading Ammunition Number 6 (1964) also draws the line at 49 grains. Most manuals ignore good old 4064 completely, while even such “intrepid” manuals (Dean Grennell’s phrase) as Lyman Reloading Handbook, 45th Edition (1970) stop at 49.0 grains. Hodgdon, which now supplies IMR powders, lists a maximum on its website of 47.5 grains of 4064 with a 130-grain bullet. There was, however, one hitch: Nowhere, in any modern loading manual that I could find, is this charge listed. 270 Winchester rifles on hand for one reason or another, this was a good chance to test this one out. Finding myself with a selection of different. The other test rifle was a new Winchester Model 70 Featherweight with a Leupold VX-III 2.5-8x 36mm riflescope. Note that he did not say equally accurate, but In my experience, a load that is excellent with one rifle may be mediocre in another, and no load ever proves to be accurate with every rifle. The comment that stuck in my mind was the one about the IMR-4064 load working well in every single. He apparently never looked back, at least for hunting loads. ![]() With H-4831, originally known as “4350 Data Powder,” O’Connor achieved both excellent accuracy and velocities pushing 3,200 fps, a significant increase over 4064. This conclusion is contrary to every burning-rate chart I have ever seen, but he arrived at it by comparing powder charges with the resulting velocities. 270s, IMR-4064 proved to be slower burning than 4320. However, O’Connor did not get the accuracy he wanted with 4350 and he found that in his. 270 Winchester’s case capacity and its later success with H-4831, which is the slowest-burning powder of those mentioned, it would seem logical that the best combination in the years before H-4831 became available would have come with either IMR-4350 or 4320. Whelen had success with this “old, much-tried prescription” but had moved on to IMR-4350 because it delivered greater velocity. Load, but he did say that its “chamber pressures are well under 50,000 psi and velocities right around the 3,000 fps mark.” He also noted that Col. 270 Winchester built by Al Biesen on an FN Deluxe Mauser action scoped with a Swarovski Z3 3-9x 36mm. In his article in 1966, Ken Waters concentrated on O’Connor’s H-4831 data and gave only passing mention to the old IMR-4064 270 test rifles but had also proved to be very accurate in every. This load, he reported in Outdoor Life (and repeated in several books), was not only accurate in his own two custom. During a year in which he tried them all and fired a reported 10,000 shots in the pursuit of his ultimate load, O’Connor determined that the most accurate was 49.5 grains of IMR-4064 with a 130-grain bullet. The powders then available to him were the IMR series of 3031, 4064, 43. Before that time, however, O’Connor had embarked on a marathon session of loading, shooting and reloading in an attempt to find the very best handload for the. Hodgdon’s 4831 appeared on the market in 1950. It delivered high velocity combined with excellent hunting accuracy. 270, propelling a 130-grain bullet (his favorite weight). By 1966 O’Connor had pretty much settled on H-4831 as the powder for the. 270 Winchester were Jack O’Connor (then Shooting Editor of Outdoor Life) and Colonel Townsend Whelen. No cratering, primer flattening or sign of even normal case expansion occurred.Īt the time, the best-known proponents of the. ![]() Except for minor differences around the striker indentation, they were uniformly almost perfect. This assortment of cases was fired in five different rifles. ![]()
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