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I don't know about the hornadys or the plated ones but the 206 gr. spitzer gc hardcast bullet does well with 19 grs or so of 4759, this is a reduced load.
I see the Frontier's are .311 diameter. Of the big makers, only Hornady seems to make a .312 diameter bullet, which might make a difference in some rifles. Hornady makes 174BTFMJ, 174 RN and a nice 150 spire-point(flat-base) which might be worth a try. I recently loaded up some old CIL 180gr Sabre-tips(.311), with 25grs IMR4198 for a very pleasant,accurate load through one of my M-10 Ross rifles.
Geoff
I've got a sub MOA loading of sierra 174 MK in front of 40 grains Varget lit by match primers in IVI military brass.
Few jungle carbines are accurate with full power loads; nature of those beasts.
A sporterised .303 is also rarely accurate with full power loads. Most people don't realize that the full length wood properly bedding the barrel is an integral part of the dynamics of the Lee Enfield rifle. Sporterising a .303 is akin to holding a garden hose 2 feet in from the end; it will whip all over when you turn on the water. I'm not saying that NO sporterised .303s shoot well; just that most don't shoot nearly as well as fully wooded ones.