Weren't the loads in the ML slug guns similar? I remember reading some of Roberts book and remember that he hunted with a Billinhurst as about 70 grains behind a 480 grain bullet. Roughly a 45-70 load. The cartridge evolution for Schuetzen was from 40-70 to 38-55 to 32-40. The 32-40 held the accuracy record for years. I think that the 32-40 used 200 grain bullets not the factory 170's. They also muzzleloaded the bullets into the cartridge mouth. The 38-55 actually held 55 grains when loaded schuetzen style. The Americans beat the Irish team using cartridge guns.
DP
DP
This is not exactly Long Rifle stuff....
There is a big difference between the picket rifles Roberts' and family used for hunting and slug rifles used for benchrest shooting and the rifles used for mid and longrange. The 45 caliber picket rifles used bullets around 300 grains or so. Loads similar to 45-90 cartridge (without looking at the book). These are not very accurate past 200 yards or so compared to the others.
The slug rifles used for target were a far different matter and the light weights weighed 18-20 pounds. 35-50 was common. Some were far larger. Some shot bullets weighing 1700 grains or more. Many of these rifles use sealed ignition. This requires more work but eliminates nipple errosion and give better accuracy.
A friend is using a 40 cal right now (40 pounds or so) with a cross patched bullet about 3 calibers long and 70 grains of FFG Swiss with sealed ignition and a percussion cap. This is a light powder charge for the time. Brockway stated that he always found the most accurate load was all the powder the barrel would burn. He shot over sheets to look for unburned powder grains. When reduced the charge just enough to keep powder off the sheets he made a measure for that charge.
The longrange ML rifles by Rigby and others such as those used by the Irish team used bullet weights and powder charges that were nearly identical to the rifles used by the American team.
90-110 grains of powder and bullets in the 520-550 range in 44-45 caliber.
One or 2 Americans loaded the bullet through the muzzle but most used fixed ammunition (so far as we know, I do not think breech seaters were invented yet). But the bullets, at least by a few years later, were only in the case about 1/16". Basically "breechseated".
The surprising part of the BL victory was the lack of experience in LR shooting in America at that time. The Americans were all "greenhorns" at the game with untried firearms, the guns were actually made AFTER the challenge was accepted. The Irish were highly experienced Champions and used fully evolved MLing long range rifles. Few thought it would won by the BLs and most doubted it would even be close and that the Irish team would run away with the competition.
Schuetzen rifles were 12-18 pound offhand and generally were 38-32 caliber in the cartridge era. Pope made 33-47s based on the 32-40 case. Pope's rifles were breech muzzle loaders. Case with powder was put in the breech and the unpatched bullet loaded though a false muzzle and pushed down to the point that gave the best accuracy. This is often NOT all the way to the cartridge case.
Some used breech seaters and still do and again often set the bullet ahead of the cartridge case by a certain amount. Today its the common system.
But at the time of the American vs Irish LR match dedicated Schuetzen rifles were percussion ignition and used picket bullets.
Really we are talking 4 very different types of firearms and 4 different shooting sports. Hunting, precision bench from 220 yards to 880 or farther with few rules (often the rifles were shot with the shooter only pressing the trigger then "catching" the rifle in recoil), longrange with rules, 10 pound weight, 3 pound trigger, no artificial support allowed and finally offhand shooting at 200 yards.
At 220 or beyond NOBODY in the 19th century and well into the 20th could compete with the ML slug guns. They just shot too well. The Sharps Borchardt LR rifle with BP ammunition was still winning LR matches till about 1900.
ML shooters who can get there should visit the Canal Fulton matches. Or the slug gun matches at Friendship.
Now I am really running late....
Dan