I have experience with Prvi Partisan loading 303, 7.5 Swissicon and 7.62X54 and find it to be good quality brass. In the 303 how long it lasts will depend on how much it is resized each firing. I have two 303 FL dies and one sizes much tighter than the other and I don't use it for that reason. 303 chambers I have seen are quite large and depending on who makes the brass I have seen brass with base measurement of .449" to .453". I have measured fired cases running upwards of .459" thusly to take this brass back to .453 you are really working the brass and this is the death of brass as it work hardens.

The 303 chambers I have seen allow for considerable forward movement of the shoulder and it "fireforms" into the chamber. In resizing if you adjust your dies for FL you will roll this shoulder back and work harden it as well. What I do is set my dies so the shoulder is only moved .001" to .002 to increase the brass life.



Also stay off the hot loads as this is hard on brass.

If you stress relieve the necks every two to three reloads you can keep the neck/shoulder in a working condition to sustain multiple resizings. Rule of thumb is if you have case necks splitting you have not cared for your cases properly before reloading.

I start off using Winchester Primers and use them till the primer pockets enlarge and primers do not fit as tightly. Continued use of US primers will result in leaking gas around edge of primer and cutting into your bolt face. While you can't tighten up the primer pockets you can obtain Wolff primers (Russianicon manufacture) which are larger diameter than ours thusly seating more snugly in primer pocket restoring the seal and you can get more loads before the case is worn out.

How many times can they be reloaded? Depends on your chamber size, how much you resize, how hot your load is, how you stress relieve the neck/shoulder etc. There is some brass that you will do well to get 3 reloads from. Other brass maybe 10 to 12 reloads.

On custom chambers it is not unheard of to reload cases 100+ times. If I were plannng on shooting and reloading 303 for many years and bearing in mind there are no more new barrels for them you need to consider other options. Using a commercial barrel turned down to fit the No 1/No 4 barrel channel is one consideration. With this change you can do things like obtain a slower twist rate replacement barrel as some bullets will shoot tighter groups with slower twist.

I have a custom chamber reamers of min dimensions which I tend to call the 222 principle which is the case body as measured .200" up from the case head not expand over .002" on firing, the neck not expand over .002", the shoulder not move forward over .002" and the throat cut at min dimension as well.

In the case of the 303 one must also consider the fact that we will never see surplus 303 ammo again and thusly the throat of the reamer could be matched to available match/hunting bullets that will be loaded and a throat/leade matched to the new bullet ogive for best accuracy. Such a reamer will probably cost $225.00 in today's prices but this is offset by the extended brass life to be reaped for such chamber dimensions and moderate loadings.

I am aware of some folks who rebarrel 303s with 30 cal barrels and custom chambers that will give much longer case life and a vastly larger selection of available bullets for hunting and or match shooting and much better accuracy properly done. RCBS for years has had a FL size die available for 303 double stamped 308 for these 30 cal loadings. Obviously doing this ruins the collector value of these rifles but it just depends on what your intended use is.